钢铁表面氟铁酸盐转化环境友好,耐蚀性较好,但转化时间较长.利用扫描电镜(SEM)、X射线衍射仪(XRD)、电化学及中性盐雾试验等分析测试技术对不同时间形成的钢铁表面氟铁酸盐转化膜的形貌结构、膜层厚度、物相组成及耐蚀性能进行了研究.结果表明:成膜过程主要包括晶核形成、晶体成长和溶解3个阶段;K3 FeF6和Fe2O3晶体组成的氟铁酸盐转化膜耐蚀性与膜层厚度成正比,2.0h晶体生长完成时,膜层达到70.9 μm的最大厚度和72 h的最长耐中性盐雾时间.
Fluoric ferrite conversion coatings were prepared at different treatment time,and the morphology structure,coating thickness,phase composition and corrosion resistance were studied by scanning electron microscopy (SEM),X-ray diffractometer (XRD),electrochemical test and salt spray test (SST).Results showed that the formation process of coating mainly included three stages:nucleation,crystal growth and crystal dissolution.The corrosion resistance of the coating which composed of K3 FeF6 and Fe2O3 phases was proportional to the thickness of coating.When the crystal growth was finished in two hours,the obtained coating possessed the optimum thickness of 70.9 μm and the longest salt spray time of 72 h.
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